Under what conditions are cigarettes and smokeless tobacco shipments prohibited in the mail?

Cigarettes and smokeless tobacco shipments are prohibited in the mail primarily when they do not meet specific exceptions outlined in postal regulations. The United States Postal Service has strict guidelines regarding the mailing of tobacco products due to health concerns and legal restrictions. These regulations allow for certain exceptions, such as shipments to licensed manufacturers or sellers, but if the shipment falls out of these predefined categories, it cannot be mailed. Therefore, understanding that only specific circumstances allow for the mailing of these products is key to the correct answer.

In contrast, other options presented do not capture the essence of the regulations. They either limit the conditions too much or misunderstand the broader rules that govern tobacco shipments. Recognizing the importance of the established exceptions ensures compliance with postal policies and federal laws.